I have used that /feeds/videos.xml URL for retrieving a list of all videos in a playlist (playlist_id), but I have not used it for channels. What is the maximum number of results that one can retrieve. Without any additional parameters, it looks like it only returns 15 videos by default.
Personally, for channels, I use a script only needs to access the channel's page; it outputs a list of all the videos in the channel. One of the more recent web development trends I dislike are sites that "load more results" using additional Javascript-triggered HTTP requests in response to scrolling a page. YouTube channels with multiple pages of videos are one example.
With custom scripts I wrote for searching YouTube, outputting lists of videos from channels, and downloading non-commercial videos, I can use YouTube without the need a graphical browser.
